Rapoport reported after the game that McGloin's injury was to his trapezius muscle, acting like a pinched nerve, per sources. The Raiders aren't ruling out McGloin, but are not optimistic about him playing against the Texans, Rapoport added.

McGloin made the start Sunday after Derek Carr broke his leg in Week 16.

Cook, a fourth-round rookie, took over and completed 14 of 21 passes for 150 yards (7.1 yards per pass) with a touchdown, interception, and a fumble lost. Cook looked every bit a rookie that had been given few practice reps before being activated for the first time. Still, the rookie outplayed McGloin, displayed an ability to get through his progression and solid tools in his first NFL appearance.

Gilbert was drafted in the sixth round in 2014 but has never thrown a regular-season pass. The 25-year-old was on the New England Patriots' practice squad in 2014 when the Pats won the Super Bowl.

Gilbert spent 2015 on Oakland's practice squad, so he has familiarity with the coaching staff.